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diff --git a/chromium/chrome/browser/resources/cryptotoken/signhelper.js b/chromium/chrome/browser/resources/cryptotoken/signhelper.js
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+++ b/chromium/chrome/browser/resources/cryptotoken/signhelper.js
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Provides a "bottom half" helper to assist with raw sign
+ * requests.
+ */
+'use strict';
+
+/**
+ * A helper for sign requests.
+ * @extends {Closeable}
+ * @interface
+ */
+function SignHelper() {}
+
+/**
+ * Attempts to sign the provided challenges.
+ * @param {Array.<SignHelperChallenge>} challenges the new challenges to sign.
+ * @return {boolean} whether the challenges were successfully added.
+ */
+SignHelper.prototype.doSign = function(challenges) {};
+
+/** Closes this helper. */
+SignHelper.prototype.close = function() {};
+
+/**
+ * A factory for creating sign helpers.
+ * @interface
+ */
+function SignHelperFactory() {}
+
+/**
+ * Creates a new sign helper.
+ * @param {Countdown} timer Timer after whose expiration the caller is no longer
+ *     interested in the result of a sign request.
+ * @param {function(number, boolean)} errorCb Called when a sign request fails
+ *     with an error code and whether any gnubbies were found.
+ * @param {function(SignHelperChallenge, string, string=)} successCb Called with
+ *     the signature produced by a successful sign request.
+ * @param {string=} opt_logMsgUrl A URL to post log messages to.
+ * @return {SignHelper} The newly created helper.
+ */
+SignHelperFactory.prototype.createHelper =
+    function(timer, errorCb, successCb, opt_logMsgUrl) {};